A typical January from my records;

  • An average temperature of 17.5C.
    • Maximum temperature expected about 34C.
    • Minimum temperature expected about 6C.
    • Twenty four days are expected to reach or exceed 20C.
    • Twelve days are expected to reach or exceed 25C.
    • Four days are expected to reach or exceed 30C.
    • No days would reach or exceed 35C on average though 2 January days in 2018 and one each in 2009 and 2016 have done
  • Wind run would be around 5450km with the windiest day expected to have a wind run of 320km.
    • Maximum wind gust would be in the region of 60km/h.
  • There would be rain on 8 days with the monthly total of around 50mm.

Rain totals for the month and year along with temperature and wind comparisons can be found here.

January Daily Observations
TemperatureWindRainfallBarometer
DateMinMaxMeanMean
(Km/h)
Gust
(Km/h)
Run (km)Prevailing Dir10 Minute Max (mm)Total (mm)Min (hPa)Max (hPa)Change (hPa)
1 13.7 33.2 20.7 4.9 33 109 East Nth /east 0 0 1008.3 1014.6 +6.3
Overcast with thick smoke from the Australian bush files obscuring the sun. Warm with hardly any wind for much of the day. A southwesterly change in the evening.
Christchurch the hottest spot in the country on New Year's Day
2 13.8 24.4 17.7 5.3 24 120 East Nth East 0 0 1001.9 1012.9 -11.0
Overcast with smoke haze in the morning. Sunny intervals in the afternoon. NE winds turning southerly in the evening.
'Just one more horror': Iconic South Island glaciers stained by Aussie bushfires
3 9.8 20.6 14.1 4.3 24 97 South Sth West 0.4 2.8 1000.3 1003.5 -3.2
Cloudy with rain from evening with light winds tending southerly.
4 8.3 18.7 13.3 6.5 33 148 South Sth West 0.2 0.2 1000.8 1009.6 +8.8
Early showers clearing before dawn. Variable cloud, southerly winds.
5 7.6 29.0 16.2 7.0 34 160 East Nth East 0 0 989.3 1008.9 -19.6
Cool and cloudy on the morning. Cloud breaking and wind turning warm northerly in the afternoon. Cooler southerly change in the evening.
6 10.5 25.8 16.0 6.2 33 140 South Sth West 0.2 0.6 990.8 999.5 +8.7
Cloud increasing in the afternoon with a few spots of rain. A period of rain in the evening. Variable winds tending southerly in the afternoon.
7 10.2 18.5 14.1 13.1 53 299 South Sth West 0.2 0.2 999.7 1015.0 +15.3
Any showers clearing before dawn. Variable cloud with a fresh cool southerly wind.
Soil moisture lower than normal nationwide, increasing fire risk
8 9.8 20.7 14.0 3.9 27 88 East Nth East 0 0 1014.5 1017.2 -2.7
Morning cloud breaking to a mostly sunny afternoon with light southerly winds turning NE.
Why summer's about to get warmer - and maybe wilder
9 11.2 28.3 17.2 4.7 29 106 East Nth East 0 0 1012.2 1017.1 +4.9
A mostly sunny day with NE winds, cloud increasing later in the afternoon with light variable winds.
'This trend is not our friend' - 2019 NZ's fourth hottest year
'A feast of information': Why weather maps are like works of art
10 10.7 19.8 15.4 6.5 34 148 East Nth East 0 0 1017.0 1019.2 +2.2
Variable high cloud, NE wind.
11 14.6 29.6 19.1 9.9 44 227 East Nth East 0 0 1003.0 1017.8 -14.8
High cloud increasing in the afternoon with a gusty nor'west change.
12 14.2 32.9 24.0 10.3 40 236 North Nth East 0 0 1001.0 1010.1 +9.1
Sunny and very warm with northerly winds. An evening change to a cool southerly.
13 12.0 19.8 15.1 6.8 30 156 East Nth East 0 0 1010.2 1027.5 +17.3
Cloud increasing around midday with a light shower early afternoon. NE wind.
14 7.2 21.1 14.3 5.4 31 122 East Nth East 0 0 1024.8 1028.5 -3.7
Some cloud, sunny with NE wind.
15 6.3 23.3 14.2 3.5 24 79 East Nth East 0 0 1025.4 1027.0 +1.6
Sunny, few clouds, light winds tending NE in the afternoon.
16 7.3 19.2 14.1 7.9 42 180 East Nth East 0 0 1023.3 1026.7 -3.4
Sunny with a few clouds, NE winds freshening in the afternoon.
17 13.3 20.6 16.0 11.5 40 263 East Ntn East 0 0 1020.7 1024.0 -3.3
Morning cloud breaking to a sunny afternoon with freshening NE winds.
18 13.2 20.3 16.2 10.8 36 246 East Nth East 0 0 1018.6 1022.4 -3.8
Few clouds at times, sunny with a freshening NE wind in the afternoon.
19 9.8 21.6 16.0 6.0 29 136 East Nth East 0 0 1017.4 1020.6 -3.2
Morning cloud breaking to a sunny day. Thin high cloud in the afternoon.
20 13.6 23.0 17.3 5.0 29 113 East Nth East 0 0 1015.4 1019.4 -4.0
Morning cloud with a few spots of drizzle. Cloud breaking to a sunny afternoon with NE wind. Cloud returning in the evening
21 13.9 22.7 18.2 6.9 36 157 East Nth East 0 0 1013.5 1017.2 -3.7
Morning cloud breaking to a sunny afternoon with a NE wind.
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